<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>my html2</title>
</head>
<body>

<ul type="square">
    <li>python</li>
    <li>html</li>
    <li>css</li>
    <li>javascript</li>
</ul>

<ul type="circle">
    <li>python</li>
    <li>html</li>
    <li>css</li>
    <li>javascript</li>
</ul>

<ul type="disc">
    <li>python</li>
    <li>html</li>
    <li>css</li>
    <li>javascript</li>
</ul>

<ul>
    <li>python</li>
    <li>html</li>
    <li>css</li>
    <li>javascript</li>
</ul>

<ol type="I" start="9">
    <li>python</li>
    <li>html</li>
    <li>css</li>
    <li>javascript</li>
</ol>

<ol type="i">
    <li>python</li>
    <li>html</li>
    <li>css</li>
    <li>javascript</li>
</ol>

<ol type="A" start="6">
    <li>python</li>
    <li>html</li>
    <li>css</li>
    <li>javascript</li>
</ol>

<ol type="a">
    <li>python</li>
    <li>html</li>
    <li>css</li>
    <li>javascript</li>
</ol>

<ol type="1">
    <li>python</li>
    <li>html</li>
    <li>css</li>
    <li>javascript</li>
</ol>

<ol>
    <li>python</li>
    <li>html</li>
    <li>css</li>
    <li>javascript</li>
</ol>

<table border="1px" width="500px">
    <tr>
        <td>阶段</td>
        <td>课程</td>
        <td>内容</td>
    </tr>
    <tr>
        <td>一</td>
        <td>linux</td>
        <td>linux system</td>
    </tr>
    <tr>
        <td>二</td>
        <td>shell</td>
        <td>shell script</td>
    </tr>
    <tr>
        <td>三</td>
        <td>db</td>
        <td>mysql database</td>
    </tr>
    <tr>
        <td>四</td>
        <td>python</td>
        <td>python programming</td>
    </tr>
    <tr>
        <td rowspan="2">111</td>
        <td colspan="2">111</td>
    </tr>
    <tr>
        <td>111</td>
        <td>111</td>
    </tr>
</table>
</body>
</html>